bug#48213: offlineimap build fails

[Bone Baboon via Bug reports for GNU Guix <bug-guix@gnu.org>]

Mark H Weaver writes:

> Hi,
>
> Bone Baboon via Bug reports for GNU Guix <bug-guix@gnu.org> writes:
>> On a x86_64 computer when I run `guix build --no-substitutes
>> offlineimap` the build fails because the "test_ipv6_available" test
>> fails.
>
> 'offlineimap' is the _only_ package in Guix that
> depends on the 'python2-rfc6555' package, it's quite painless to work
> around this particular issue using Guix's "--without-tests" package
> transformation option.
>
> From the command line, you can simply do this:
>
>   guix build offlineimap --without-tests=python2-rfc6555
>
> Within an OS configuration, or within a profile "manifest" file (if you
> use "guix package --manifest", which is highly recommended), you can use
> the following Scheme expression in place of 'offlineimap':
>
> --8<---------------cut here---------------start------------->8---
>   (let ((transform (options->transformation
>                     '((without-tests . "python2-rfc6555")))))
>     (transform offlineimap))
> --8<---------------cut here---------------end--------------->8---
>
> Note that you'll also need to put "(use-modules (guix transformations))"
> at the top of the file, to import the 'options->transformation'
> procedure.
>
> Please let us know if this works for you.

Thank you

I can build offlineimap with this command `guix build offlineimap
--no-substitutes --without-tests=python2-rfc6555`.

How would I refer to offlineimap (built without tests) in the
configuration of a substitute server's client?  The client is not
building it's own packages and is instead relying on a substitute
server to build offlineimap without tests.